Tower section structure of rectifying tower

Abstract

The utility model provides a tower section structure of a rectifying tower, which belongs to the technical field of rectifying towers and comprises an outer-layer cylinder, an inner-layer cylinder and a middle-layer cylinder, the middle-layer cylinder is positioned between the outer-layer cylinder and the inner-layer cylinder, and the middle-layer cylinder is respectively separated from the outer-layer cylinder and the inner-layer cylinder by a set distance; the top end of the outer-layer cylinder and the top end of the inner-layer cylinder are connected through a first hollow circular truncated cone, the bottom of the outer-layer cylinder is fixedly connected with a lower-layer circular truncated cone bottom support, and the bottom of the middle-layer cylinder is fixedly connected with a porous circular bottom through a second hollow circular truncated cone. According to the rectifying tower, the roundabout and staggered space structure is arranged in the tower section, so that the steam circulation length is increased, and the height of the tower section can be effectively reduced while the separation effect of the rectifying tower is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical distillation separation devices, and in particular relates to a distillation tower section structure. Background Art

[0002] The tower section of a distillation tower is an important part of the tower body. It is usually a vertical cylindrical structure with a simple structure and a single function. Packing or plates are generally installed inside the tower section to provide good circulation and certain constraints for the realization of vapor-liquid exchange, thereby increasing the contact area between vapor and liquid, promoting mass transfer and heat transfer, and effectively separating complex components.

[0003] At present, most of the traditional distillation tower sections that are widely used and produced and sold on the market are similar in structure. Their advantages are simple structure and low manufacturing technology requirements. However, in order to ensure the separation effect, they usually have a relatively high height. Although the device parameters and selection can be calculated based on the research on distillation principles, the packing height can be effectively reduced through comprehensive consideration of material composition and physical property relationship, as well as filler selection and characteristic parameters, and thus the tower section height can be reduced. However, this method is always based on the traditional tower section as the device basis, and its structure limits the ability to "reduce height" to a certain extent. Utility Model Content

[0004] In view of the defects or shortcomings in the prior art, the utility model provides a distillation tower section structure, which increases the length of steam circulation by arranging a tortuous and staggered spatial structure inside the tower section, thereby effectively reducing the tower section height while ensuring the separation effect of the distillation tower.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An embodiment of the utility model provides a distillation tower section structure, comprising an outer cylinder, an inner cylinder and a middle cylinder, wherein the middle cylinder is located between the outer cylinder and the inner cylinder, and the middle cylinder is spaced apart from the outer cylinder and the inner cylinder by a set distance, the top of the outer cylinder and the top of the inner cylinder are connected via a first hollow cone, the bottom of the outer cylinder is fixedly connected to a lower cone base, and the bottom of the middle cylinder is fixedly connected to a porous bottom via a second hollow cone.

[0007] Furthermore, the first hollow cone is an inverted cone-shaped structure, which is hollow inside and opened at both ends, wherein the diameter of the large diameter end of the first hollow cone is the same as the diameter of the outer cylinder, the diameter of the small diameter end of the first hollow cone is the same as the diameter of the inner cylinder, the large diameter end of the first hollow cone is fixedly connected to the top end of the outer cylinder, and the small diameter end of the first hollow cone is fixedly connected to the top end of the inner cylinder.

[0008] Further, the second hollow frustum has the same structure as the first hollow frustum. The diameter of the large-diameter end of the second hollow frustum cylinder is the same as the diameter of the middle-layer cylinder. The diameter of the small-diameter end of the second hollow frustum is the same as the diameter of the porous round bottom. The large-diameter end of the second hollow frustum is fixedly connected to the bottom end of the middle-layer cylinder.

[0009] Further, a circular groove is provided in the central region of the porous round bottom. A plurality of circular through holes are formed on the bottom surface of the circular groove. Vertical overflow conduits are provided in the circular through holes. The top pipe orifice of the overflow conduit is higher than the height of the bottom surface of the circular groove, and the bottom end of the overflow conduit is lower than the bottom surface of the porous round bottom.

[0010] Further, the lower-layer round-bottom support includes a third hollow frustum. The structure of the third hollow frustum is the same as that of the second hollow frustum. A second inner-ring circular ring extending horizontally inward is provided at the lower edge of the inner side of the bottom end of the third hollow frustum. The second inner-ring circular ring is connected to a second packing support plate by bolts.

[0011] Further, a first packing support plate is fixedly connected to the top of the inner-layer cylinder. Both the second packing support plate and the first packing support plate are of disc-shaped structures. Mesh baffles are provided on the inner sides of the first packing support plate and the second packing support plate, and the mesh baffles are distributed in a net shape.

[0012] Further, anti-wall-flow rings are provided on the inner and outer sides of the inner-layer cylinder, the inner and outer sides of the middle-layer cylinder, and the inner side of the outer-layer cylinder. The anti-wall-flow rings are located at the top and middle of the inner-layer cylinder, the middle-layer cylinder, and the outer-layer cylinder. The anti-wall-flow rings are of circular-ring structures and are arranged obliquely downward.

[0013] Further, a plurality of raised round holes, a plurality of concave arcs, and a plurality of flow guiding tips are annularly distributed on the anti-wall-flow ring. Curled edges that bend upward are provided at the edges of the raised round holes and the concave arcs. The tips of the flow guiding tips are subjected to passivation and rounding treatments.

[0014] Further, a fixed support frame is also provided between the second hollow frustum and the third hollow frustum. The fixed support frame includes a first circular ring, a second circular ring, a third circular ring, and a fourth circular ring. The first circular ring is fixedly connected to the outer side of the top end of the second hollow frustum. The second circular ring is fixedly connected to the inner side of the top end of the third hollow frustum. The third circular ring is fixedly connected to the outer side of the bottom end of the second hollow frustum. The lower surface of the fourth circular ring is fixedly connected to the upper surface of the second inner-ring circular ring of the lower-layer round-bottom support.

[0015] Further, a plurality of outer-layer short rods are connected between the first circular ring and the second circular ring. A plurality of upper-layer long rods are connected between the third circular ring and the first circular ring. A plurality of lower-layer long rods are connected between the second circular ring and the fourth circular ring. A plurality of inner-layer short rods are connected between the fourth circular ring and the third circular ring.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] The present utility model is provided with an outer cylinder, a middle cylinder and an inner cylinder. The middle cylinder is located between the outer cylinder and the inner cylinder. The top ends of the outer cylinder and the inner cylinder are connected by a first hollow frustum. The bottom of the outer cylinder is fixedly connected with a lower frustum base. The bottom of the middle cylinder is fixedly connected with a porous round bottom through a second hollow frustum. This forms a circuitous and interlaced spatial structure inside the tower section. Steam flows through this circuitous and interlaced spatial structure, increasing the length of the steam flow path. Therefore, a relatively high tower section height is not required. Compared with the tower sections of traditional distillation columns, the length of the steam flow path is increased, greatly promoting the efficiency of vapor-liquid mass transfer and heat transfer, being conducive to improving the separation effect of the distillation column, and significantly reducing the height of the tower section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a longitudinal sectional view of the tower section structure in an embodiment of the present utility model;

[0019] Figure 2 It is a cross-sectional view of the outer surrounding structure in an embodiment of the present utility model;

[0020] Figure 3 It is a sectional view of the internal cylinder structure in an embodiment of the present utility model;

[0021] Figure 4 It is a longitudinal sectional view of the porous round bottom in an embodiment of the present utility model;

[0022] Figure 5 It is a top view of the porous round bottom in an embodiment of the present utility model;

[0023] Figure 6 It is a sectional view of the lower frustum base structure in an embodiment of the present utility model;

[0024] Figure 7 It is a top view of the first packing support tray in an embodiment of the present utility model;

[0025] Figure 8 It is a top view of the anti-wall-flow ring in an embodiment of the present utility model;

[0026] Figure 9 It is a partial enlarged view of the anti-wall-flow ring in an embodiment of the present utility model;

[0027] Figure 10 It is a structural schematic diagram of the fixed support frame in an embodiment of the present utility model;

[0028] Among them, 1. Outer surrounding structure; 101. Outer cylinder; 102. First hollow frustum; 103. Inner cylinder; 104. First inner ring; 105. First outer ring; 2. Inner cylinder structure; 201. Middle cylinder; 202. Second hollow frustum; 203. Porous round bottom; 2031. Circular groove; 2032. Circular through-hole; 2033. Overflow conduit; 3. Lower frustum bottom support; 301. Third hollow frustum; 302. Second packing support plate; 303. Second outer ring; 304. Second inner ring; 4. Fixed support frame; 401. First ring; 402. Second ring; 403. Third ring; 404. Fourth ring; 405. Outer short rod; 406. Upper long rod; 407. Lower long rod; 408. Inner short rod; 5. Anti-wall-flow ring; 501. Raised round hole; 502. Concave arc; 503. Flow guide tip; 6. First packing support plate; 601. Grid baffle. Specific implementation mode

[0029] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0030] A typical implementation mode of the present utility model is as Figure 1 shown. A rectifying column section structure includes an outer surrounding structure 1, an inner cylinder structure 2 and a lower frustum bottom support 3. Among them, the inner cylinder structure 2 is located inside the outer surrounding structure 1, the lower frustum bottom support 3 is fixed at the bottom end of the outer surrounding structure 1, and the outer surrounding structure 1, the inner cylinder structure 2 and the lower frustum bottom support 3 are all arranged inside the rectifying column section housing.

[0031] Specifically, as Figure 1 shown, the outer surrounding structure 1 includes an outer cylinder 101 and an inner cylinder 103. The diameter of the inner cylinder 103 is smaller than that of the outer cylinder 101, and the length of the inner cylinder 103 is smaller than that of the outer cylinder 101. The inner cylinder 103 is sleeved inside the outer cylinder 101, and the axes of the inner cylinder 103 and the outer cylinder 101 coincide. Horizontal outward-extending first outer rings 105 are arranged on the outer sides of the top end and the bottom end of the outer cylinder 101, and a horizontal inward-extending first inner ring 104 is arranged on the inner side of the top end of the inner cylinder 103. A plurality of threaded holes are annularly distributed on the first outer ring 105 and the first inner ring 104. The first outer ring 105 at the top end of the outer cylinder 101 is fixedly connected to other rectifying column sections by bolts, the first outer ring 105 at the bottom end of the outer cylinder 101 is fixedly connected to the lower frustum bottom support 3 by bolts, and the inner cylinder 103 is fixedly connected to the first packing support plate 6 through the first inner ring 104.

[0032] The top ends of the outer cylinder 101 and the inner cylinder 103 are connected by the first hollow frustum 102. Specifically, the first hollow frustum 102 is an inverted frustum-shaped structure with a hollow interior and openings at both ends. The diameter of the large end of the first hollow frustum 102 is the same as the diameter of the outer cylinder 101, and the diameter of the small end of the first hollow frustum 102 is the same as the diameter of the inner cylinder 103. The large end of the first hollow frustum 102 is fixedly connected to the top end of the outer cylinder 101, and the small end of the first hollow frustum 102 is fixedly connected to the top end of the inner cylinder 103, thereby realizing the connection of the top ends of the outer cylinder 101 and the inner cylinder 103.

[0033] As Figure 3 shown, the internal cylinder structure 2 includes a middle cylinder 201, a second hollow frustum 202, and a porous round bottom 203. The diameter of the middle cylinder 201 is larger than the diameter of the inner cylinder 103 and smaller than the diameter of the outer cylinder 101. The middle cylinder 201 is located between the outer cylinder 101 and the inner cylinder 103 and is at a set distance from the outer cylinder 101 and the inner cylinder 103 respectively, so as to form channels for steam to flow between the outer cylinder 101 and the middle cylinder 201 and between the middle cylinder 201 and the inner cylinder 103. The axis of the middle cylinder 201 coincides with the axes of the outer cylinder 101 and the inner cylinder 103. The porous round bottom 203 is a disc-shaped structure, arranged below the middle cylinder 201 and connected to the bottom end of the middle cylinder 201 through the second hollow frustum 202. The second hollow frustum 202 has the same structure as the first hollow frustum 102, which will not be elaborated here. The diameter of the large end of the second hollow frustum 202 is the same as the diameter of the middle cylinder 201, and the diameter of the small end of the second hollow frustum 202 is the same as the diameter of the porous round bottom 203. The large end of the second hollow frustum 202 is fixedly connected to the bottom end of the middle cylinder 201. A plurality of threaded holes are annularly distributed on the circumferential side of the porous round bottom 203, and the plurality of threaded holes are evenly distributed. The porous round bottom 203 is fixedly connected to the small end of the second hollow frustum 202 through bolts.

[0034] As Figure 4 and Figure 5 shown, a circular groove 2031 is provided in the central area of the porous round bottom 203. A plurality of circular through holes 2032 are opened on the bottom surface of the circular groove 2031. Vertical overflow ducts 2033 are provided in the circular through holes 2032. The top pipe orifice of the overflow duct 2033 is higher than the bottom surface height of the circular groove 2031, and the bottom end of the overflow duct 2033 is lower than the bottom surface of the porous round bottom 203.

[0035] The inner diameters of the inner cylinder 103, the middle cylinder 201, and the outer cylinder 101 are in the ratio of 1: , after rounding, it is 100:142:173, and the interval ratio between the middle cylinder 201 and the inner cylinder 103 and the outer cylinder 101 is 42:31. Such a design is conducive to the stable flux and flow rate of steam in the channel and is conducive to ensuring the stability of the rectification system.

[0036] As Figure 6 shown, the lower frustum base 3 is arranged at the bottom of the outer surrounding structure 1, including a third hollow frustum 301. The structure of the third hollow frustum 301 is the same as that of the second hollow frustum 202 and will not be elaborated here. A second outer ring 303 extending horizontally outward is arranged on the outer side of the top end of the third hollow frustum 301, and a second inner ring 304 extending horizontally inward is arranged on the inner side of the lower edge of the bottom end of the third hollow frustum 301. A plurality of bolt holes are annularly distributed on the second outer ring 303 and the second inner ring 304, and the plurality of bolt holes are evenly arranged. The plurality of threaded holes on the second outer ring 303 correspond to the plurality of threaded holes on the first outer ring 105 at the bottom end of the outer cylinder 101, so that the lower frustum base 3 is fixed to the bottom of the outer surrounding structure 1 through bolts.

[0037] The second inner ring 304 is connected with a second packing support plate 302 through bolts. Both the second packing support plate 302 and the first packing support plate 6 are disc-shaped structures. As Figure 7 shown, grid baffles 601 are arranged on the inner sides of the first packing support plate 6 and the second packing support plate 302, and the grid baffles 601 are distributed in a net shape.

[0038] The remaining space inside the tower section is filled with packing, and the packing fills the entire inside of the tower section unit. During use, steam enters the tower section from the second packing support plate 302, reaches the interlayer space between the outer cylinder 101 and the middle cylinder 201, then turns and passes through the interlayer space between the middle cylinder 201 and the inner cylinder 103, reaches the bottom of the inner cylinder structure 2 and then turns upward through the inner cylinder 103, and finally flows out from the first packing support plate 6 at the top end of the inner cylinder 103 and reaches the next unit tower section. During this process, the steam experiences a long path, can fully complete the mass transfer and heat transfer work, and is conducive to improving the separation efficiency and product quality of the rectification tower.

[0039] During this process, the circular groove 2031 on the porous round bottom 203 can accumulate a small amount of liquid, and the height of the overflow conduit 2033 can control the height of the accumulated liquid, and thus control the capacity of the accumulated liquid, so that the excess liquid overflows from the upper port of the conduit to the lower layer, which can effectively solve the problem of poor separation effect caused by excessive liquid accumulation.

[0040] As Figure 1 and Figure 8As shown in the figure, anti-wall-flow rings 5 are provided on the inner and outer sides of the inner cylinder 103, the inner and outer sides of the middle cylinder 201, and the inner side of the outer cylinder 101. The anti-wall-flow rings 5 are located at the top and middle of the inner cylinder 103, the middle cylinder 201, and the outer cylinder 101. The anti-wall-flow rings 5 are in a circular ring structure and are inclined downward, as Figure 9 shown. A plurality of raised round holes 501, a plurality of concave arcs 502, and a plurality of flow guiding tips 503 are annularly distributed on the anti-wall-flow ring 5. Curled edges that bend upward are provided at the edges of the raised round holes 501 and the concave arcs 502. The tips of the flow guiding tips 503 are subjected to passivation and rounding treatment.

[0041] Among them, the raised round holes 501 can reduce the influence of the anti-wall-flow ring 5 on the steam flow rate. The curled edges provided on the raised round holes 501 and the concave arcs 502 can enable the liquid flowing down the wall to flow downward along the curled edges to the flow guiding tips. The flow guiding tips 503 guide the liquid to a suitable position, effectively preventing the occurrence of the wall-flow phenomenon.

[0042] The setting of the anti-wall-flow ring 5 can effectively prevent the phenomenon that the liquid flows down along the inner wall of the tower section, reduce the wall-flow effect, is beneficial to increasing the exchange area and contact time between the vapor and the liquid, and further improving the mass transfer and heat transfer efficiency of the distillation column.

[0043] A fixed support frame 4 is also provided between the second hollow frustum 202 and the third hollow frustum 301 for supporting the internal cylinder structure 2 to ensure the stability of the internal cylinder structure 2. Specifically, as Figure 10 shown, the fixed support frame 4 includes a first ring 401, a second ring 402, a third ring 403, and a fourth ring 404. The first ring 401, the second ring 402, the third ring 403, and the fourth ring 404 are arranged in sequence from top to bottom, and the axes of the first ring 401, the second ring 402, the third ring 403, and the fourth ring 404 coincide. The cross-sections of the first ring 401 and the third ring 403 are right-angled triangles with inclined surfaces slanting upward, the cross-section of the second ring 402 is a right-angled triangle with an inclined surface slanting downward, and the cross-section of the fourth ring 404 is a rectangle. The inclined surface on the first ring 401 fits with the outer side of the top end of the second hollow frustum 202, the inclined surface on the second ring 402 fits with the inner side of the top end of the third hollow frustum 301, the inclined surface on the third ring 403 fits with the outer side of the bottom end of the second hollow frustum 202, and the lower surface of the fourth ring 404 fits with the upper surface of the second inner ring 304 of the lower frustum base 3.

[0044] A number of outer short rods 405 are connected between the first ring 401 and the second ring 402, a number of upper long rods 406 are connected between the third ring 403 and the first ring 401, a number of lower long rods 407 are connected between the second ring 402 and the fourth ring 404, and a number of inner short rods 408 are connected between the fourth ring 404 and the third ring 403.

[0045] By setting the cross-sections of the first ring 401, the second ring 402, and the third ring 403 as right-angled triangles with inclined surfaces, a larger contact area between the fixed support frame 4 and the internal cylindrical structure 2 and the lower frustum base 3 can be achieved, ensuring the stability and safety of the device. At the same time, the design of the frame structure occupies less space, providing more space for other devices.

[0046] Rectification tower sections are usually installed with multiple tower section units connected vertically. As Figure 1 shown is a heterogeneous tower section unit, and there are two connection methods. One is to stack multiple complete tower section units from bottom to top in sequence, and the first outer ring 105 of the bottom tower section is docked and fixed with the second outer ring 303 of the heterogeneous tower section of the previous unit. The other is to use one tower section unit as the bottom, and install the following components in sequence on its upper main structure: fixed support frame 4 - lower frustum base 3 - outer surrounding structure 1 - fixed support frame 4 - lower frustum base 3 - outer surrounding structure 1... and so on. At the same time, sealing rings and bolts are used to fixedly connect between adjacent main structures. In addition, before installation, the anti-wall-flow ring 5 and the packing support tray need to be installed on the main structure in advance, and the packing also needs to be filled during the construction process. With such a design, the device can be assembled and built according to actual needs. The former is convenient for installation and disassembly, but the cost is slightly higher than the latter. The latter has a lower device cost, but the installation process is slightly more complex than the former.

[0047] The above description is only the preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various modifications and changes can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A distillation column section structure, characterized in that, It includes an outer cylinder, an inner cylinder and a middle cylinder. The middle cylinder is located between the outer cylinder and the inner cylinder, and there is a set distance between the middle cylinder and the outer cylinder and the inner cylinder respectively. The top ends of the outer cylinder and the inner cylinder are connected by a first hollow frustum. The bottom of the outer cylinder is fixedly connected with a lower frustum base. The bottom of the middle cylinder is fixedly connected with a porous round bottom through a second hollow frustum.

2. The structure of a distillation column section according to claim 1, characterized in that, The first hollow frustum is an inverted frustum-shaped structure, which is hollow inside and has openings at both ends. The diameter of the large end of the first hollow frustum is the same as the diameter of the outer cylinder, and the diameter of the small end of the first hollow frustum is the same as the diameter of the inner cylinder. The large end of the first hollow frustum is fixedly connected with the top end of the outer cylinder, and the small end of the first hollow frustum is fixedly connected with the top end of the inner cylinder.

3. The structure of a distillation column section according to claim 2, characterized in that, The second hollow frustum has the same structure as the first hollow frustum. The diameter of the large end of the second hollow frustum cylinder is the same as the diameter of the middle cylinder, and the diameter of the small end of the second hollow frustum is the same as the diameter of the porous round bottom. The large end of the second hollow frustum is fixedly connected with the bottom end of the middle cylinder.

4. The structure of a distillation column section according to claim 1, characterized in that, A circular groove is provided in the central area of the porous round bottom. A plurality of circular through holes are opened on the bottom surface of the circular groove. Vertical overflow conduits are provided in the circular through holes. The top pipe orifice of the overflow conduit is higher than the bottom surface height of the circular groove, and the bottom end of the overflow conduit is lower than the bottom surface of the porous round bottom.

5. The structure of a distillation column section according to claim 3, characterized in that, The lower frustum base includes a third hollow frustum. The structure of the third hollow frustum is the same as that of the second hollow frustum. A horizontally inward-extending second inner ring is provided at the inner lower edge of the bottom end of the third hollow frustum. The second inner ring is connected with a second packing support plate through bolts.

6. The structure of a distillation column section according to claim 5, characterized in that, A first packing support plate is fixedly connected to the top of the inner cylinder. The second packing support plate and the first packing support plate are both disc-shaped structures. Mesh baffles are provided inside both the first packing support plate and the second packing support plate, and the mesh baffles are distributed in a net shape.

7. The structure of a distillation column section according to claim 1, characterized in that, Anti-wall flow rings are provided on the inner and outer sides of the inner cylinder, the inner and outer sides of the middle cylinder, and the inner side of the outer cylinder. The anti-wall flow rings are located at the top and middle of the inner cylinder, the middle cylinder and the outer cylinder. The anti-wall flow rings are circular ring-shaped structures and are inclined downward.

8. The structure of a distillation column section according to claim 7, characterized in that, A plurality of raised round holes, a plurality of concave arcs and a plurality of flow guiding tips are annularly distributed on the anti-wall flow ring. The edges of the raised round holes and the concave arcs are provided with upward-bending flanges, and the tips of the flow guiding tips are blunt and rounded.

9. The structure of a distillation column section according to claim 5, characterized in that, A fixed support frame is also provided between the second hollow frustum and the third hollow frustum. The fixed support frame includes a first ring, a second ring, a third ring and a fourth ring. The first ring is fixedly connected to the outer side of the top end of the second hollow frustum. The second ring is fixedly connected to the inner side of the top end of the third hollow frustum. The third ring is fixedly connected to the outer side of the bottom end of the second hollow frustum. The lower surface of the fourth ring is fixedly connected to the upper surface of the second inner ring of the lower frustum base.

10. A distillation column section structure according to claim 9, characterized in that, A number of outer short rods are connected between the first ring and the second ring, a number of upper long rods are connected between the third ring and the first ring, a number of lower long rods are connected between the second ring and the fourth ring, and a number of inner short rods are connected between the fourth ring and the third ring.

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